I am sure these will be OK, but I am always retiscent to buy old Russianicon NVG kit, due primarily to the way they handle them on personal issue.
These do look all metal, and I am sure provide a cracking picture if they are still operative, but do be aware of any plastic support parts around the tubes.

In the past we had to withdraw ALL Russian NVG's in the UKicon that were issued to their soldiers in canvas bags and on the second hand market in their thousands ie early 1990's -2000. They were mostly plastic including the handles. Image below.
When checks were don on whether they were radiating "anything" it was found that more radiation came back through the viewer to the user......so buyer beware!!